Dog running or Cani-cross is a growing activity and does not need special equipment, although many do use a special harness for training and competitive events. The harness helps to channel the dogs energy away from the neck to their chest. Even if you are not entering your dog into a Cani-X event, running with your dog can really help with your fitness training and is a great variation to your training plans. Please remember that you do need to take into account the temperature and the surfaces that you are running on. Hot days and/or hard surfaces are not going to do your dog any good.